/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

new Promise(resolve => {
  setTimeout(() => {
		resolve('hello');
	}, 10);
}).then(value => {
  return new Promise(resolve => {
    setTimeout(() => {
			resolve(value + ' lagou');
		}, 10);
  }) 
}).then(value => {
  setTimeout(() => {
		var result = value + ' I love U';
    console.log(result);
	}, 10);
})